- 行业: Mining
- Number of terms: 33118
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- Company Profile:
The U.S. Bureau of Mines (USBM) was the primary United States Government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources.
Founded on May 16, 1910, through the Organic Act (Public Law 179), USBM's missions ...
A monoclinic mineral, 8((Mn,Fe,Mg,Ca)<sub>2</sub>(PO<sub>4</sub>)(F,OH)) ; brown; forms fibrous masses; in granite pegmatites.
Industry:Mining
A monoclinic mineral, 8((Mn,Fe,Mg,Ca)<sub>2</sub>(PO<sub>4</sub>)(F,OH)) ; brown; forms fibrous masses; in granite pegmatites.
Industry:Mining
A monoclinic mineral, 8(Al(OH)<sub>3</sub>) ; pisolitic; in micalike crystals, or stalactitic and spheroidal forms; a constituent of bauxite associated with boehmite and/or diaspore; formed by weathering of igneous rocks, esp. nepheline syenite; also in veins; a source of aluminum and synthetic abrasives. In emery deposits formed by thermal or regional metamorphism of bauxites, gibbsite occurs as an alteration crust on corundum.
Industry:Mining
A monoclinic mineral, 8(Al(OH)<sub>3</sub>) ; pisolitic; in micalike crystals, or stalactitic and spheroidal forms; a constituent of bauxite associated with boehmite and/or diaspore; formed by weathering of igneous rocks, esp. nepheline syenite; also in veins; a source of aluminum and synthetic abrasives. In emery deposits formed by thermal or regional metamorphism of bauxites, gibbsite occurs as an alteration crust on corundum.
Industry:Mining
A monoclinic mineral, 8(CaSO<sub>4</sub>.2H<sub>2</sub>O) ; colorless to white in crystals, but massive beds may range from red to yellow to brown, gray, or black; the most common natural sulfate; defines 2 on the Mohs hardness scale; commonly associated with rock salt (halite) and anhydrite; forms beds and lenses interstratified with limestone, shale, and clay, esp. in rocks of Permian to Triassic age; also in volcanic fumarolic deposits; an accessory mineral in metalliferous veins.
Industry:Mining
A monoclinic mineral, 8(CaSO<sub>4</sub>.2H<sub>2</sub>O) ; colorless to white in crystals, but massive beds may range from red to yellow to brown, gray, or black; the most common natural sulfate; defines 2 on the Mohs hardness scale; commonly associated with rock salt (halite) and anhydrite; forms beds and lenses interstratified with limestone, shale, and clay, esp. in rocks of Permian to Triassic age; also in volcanic fumarolic deposits; an accessory mineral in metalliferous veins.
Industry:Mining
A monoclinic mineral, 8(Pb<sub>4</sub>(SO<sub>4</sub>)(CO<sub>3</sub>)<sub>2</sub>(OH)<sub>2</sub>) ; trimorphous with macphersonite and susannite; soft; may fluoresce yellow; in oxidized zones of lead-ore deposits.
Industry:Mining
A monoclinic mineral, 8(Zn<sub>2</sub>(AsO<sub>4</sub>)(OH).H<sub>2</sub>O) .
Industry:Mining
A monoclinic mineral, 96(Cu<sub>2</sub>S) ; pseudohexagonal, metallic gray-black with blue to green tarnish; sp gr, 5.5 to 5.8; a secondary vein mineral; an important source of copper.
Industry:Mining
A monoclinic mineral, 96(Cu<sub>2</sub>S) ; pseudohexagonal, metallic gray-black with blue to green tarnish; sp gr, 5.5 to 5.8; a secondary vein mineral; an important source of copper.
Industry:Mining
